Messages have been spreading on Facebook claiming that the social network will be closed between February 29th and February 31st, 2013. Some users have taken it at face value and shared it with their friends. The messages appear to be particularly prevalent in French maybe it was a gallic wag who started off the chain letter? The messages don’t mention this, although the messages dont mention this on June 31st – it’s because those days don’t exist – and it’s a practical joke.”]
Source: https://grahamcluley.com/facebook-closed-maintenance-february/